Royal nicknames

In France, they were almost semi-official:
http://en.wikipedia.org/wiki/List_of_French_monarchs

Longhair, Old, Great or Young, Lazy, Just, Short, Pious, Bald, Stammerer, Fat, Simple, from Overseas, Lazy again, Wise, Amorous, Fat again, Young again, Lion, Saint, Bold, Fair, Quarreller, Posthumous, Tall, Fair again, Fortunate, Good, Wise again, Beloved or Mad, Viuctorious, Prudent, Affable, Father of the People, Restorer of Letters, Green Gallant, Just again, Sun King, Beloved, Restorer of Liberty (and much good it did him), Citizen King.